Earlier quoted context omitted.
Maybe I'm missing something, but isn't it the exact opposite of a meritocracy? If someone makes something awesome, it doesn't really matter if they're 14 year olds, women, men or aliens. I know at least I'd high five someone who made something cool, regardless of gender/age/other factors.
The parent is describing the postmodern definition of Meritocracy where "merit" is just a point view. In that world all achievements/failures must be evaluated in light of the person or group's privilege/race/class/gender and sexuality. People who subscribe to this definition really don't believe in meritocracy as it's generally viewed as a way to institutionalize white male advantage. Just a heads up :)
Simply put, having a diverse workforce is better because it introduces diversity in work.